Ex1
1. By the time we got
there, they had sold all the books
2. He understood that he
had got off at the wrong station.
3. By the time I left
the office, the storm had already stopped.
4. When I met him, he
had already lived in Paris for ten years.
5. I was at home for
about three hours when you had rung me.
6. Lanny didn’t know who
had attacked him in the darkness.
7. In the morning we
found out that the river had frozen during the night.
Ex2
1. Pedro studied French
before he had gone to Paris.
2. We went to the cinema
when the picture had begun.
3. Hob ate all the
cakes when Olaf had come to the house.
4. I thought he knew
English well after he had lived in England for some years.
5. I recognized her as
soon as my mother had described her to me very well.